Adaptor for use with a driver, a drill, and a cannula for drilling into bone

ABSTRACT

A adaptor is used with a driver, a drill, and a cannula to facilitate removal of material from bone and placement of the cannula in the bone. The adaptor includes an end portion provided at a proximal first end that is configured to engage a portion of the drill; a body portion attached to the end portion and extending from the end portion toward a distal second end; a head portion provided at the distal second end and attached to the body portion; and a passageway for receiving the drill that extends through the adaptor. Furthermore, the head portion includes a distal surface and at least one coupler provided on or adjacent the distal surface for releasably engaging, the cannula.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention is generally directed to an adaptor used to aid inthe placement of a cannula into bone. More particularly, the presentinvention is directed to an adaptor for releasably coupling to a cannulaand engagement to a driver to facilitate manipulation of the cannulausing the driver. More specifically, the present invention is directedto an adaptor for affording forward linear force applied to a driver tobe transferred through the adaptor to a cannula releasably coupled tothe adaptor, and for preventing a drill from extending more than adesired amount out of the cannula in order to facilitate placement ofthe cannula into bone.

Description of the Prior Art

Cannulas are used to afford access to portions of the human body. Suchcannulas provide access to a portion of the human body via a passagewayextending therethrough. Typically, a cannula is manipulated by a user,such as a surgeon, to facilitate placement in the human body. If thecannula is to provide access to bone, the surgeon can manipulate thecannula by hand to a position adjacent the bone, and then apply bluntforce to the cannula to facilitate its placement into the bone. A drillcan then be inserted through the passageway in the cannula to removematerial from the bone. In doing so, an aperture is formed in the bone.Thereafter, instruments can be inserted through the passageway in thecannula to the aperture formed in the bone. As such, the process forplacing cannulas has typically required multiple steps, and thesemultiple steps add complexity to surgeries involving the placement ofsuch cannulas into bone. Therefore, there is a need for tools thatsimplify placement of cannulas into bone. Such tools can include anadaptor that affords forward linear force applied to a driver to betransferred through the adaptor to a cannula releasably coupled to theadaptor, and prevents a drill from extending more than a desired amountout of the cannula in order to facilitate placement of the cannula intobone.

SUMMARY OF THE INVENTION

The present invention in one preferred embodiment contemplates anadaptor for use with a driver, a drill, and a cannula, the adaptorincluding a proximal first end, an opposite distal second end, amid-longitudinal axis extending through the proximal first end and thedistal second end, a length extending between the proximal first end andthe opposite distal second end, an end portion provided at the proximalfirst end, the end portion being configured to engage a portion of thedrill, a body portion attached to the end portion and extending from theend portion toward the distal second end, a head portion provided at thedistal second end, the head portion being attached to the body portion,the head portion including a distal surface and at least one couplerprovided on or adjacent the distal surface, the at least one couplerbeing configured to releasably engage the cannula, and a passagewayextending through the end portion, the body portion, and the headportion, the passageway extending between a first opening formed in theend portion and a second opening formed in the head portion, themid-longitudinal axis extending through the passageway, the passagewaybeing configured to receive a portion of the drill therethrough.

The present invention in another preferred embodiment contemplates anassembly for removal of material from bone and placement of at least aportion of the assembly in the bone, the assembly including an adaptorhaving a proximal first end, an opposite distal second end, amid-longitudinal axis extending through the proximal first end and thedistal second end, a length extending between the proximal first end andthe opposite distal second end, an end portion provided at the proximalfirst end, the end portion being configured to engage a portion of adrill, a body portion attached to the end portion and extending from theend portion toward the distal second end, a head portion provided at thedistal second end, the head portion being attached to the body portion,the head portion including a distal surface and at least one couplerprovided on or adjacent the distal surface, the at least one couplerbeing configured to releasably engage a cannula, and a passagewayextending through the end portion, the body portion, and the headportion, the passageway extending between a first opening formed in theend portion and a second opening formed in the head portion, themid-longitudinal axis extending through the passageway, the passagewaybeing configured to receive a portion of the drill therethrough; adriver having a chuck configured to engage a portion of the drill, thedriver being configured to rotate the drill engaged to the chuck in atleast one rotational direction; a drill including a key portion forengaging the chuck of the driver, a collar portion for engaging the endportion of the adaptor, and a shaft portion including flutesfacilitating removal of material from the bone; and a cannula having atleast one complementary coupler for engaging the at least one coupler onthe adaptor, the engagement of the at least one coupler and the at leastone complementary coupler preventing rotation of the adaptor and thecannula with respect to one another in at least one rotationaldirection.

The present invention in yet another preferred embodiment contemplatesan assembly for removal of material from bone and placement of at leasta portion of the assembly in the bone, the assembly including an adaptorhaving a proximal first end, an opposite distal second end, amid-longitudinal axis extending through the proximal first end and thedistal second end, a length extending between the proximal first end andthe opposite distal second end, an end portion provided at the proximalfirst end, the end portion being configured to engage a portion of adrill, a body portion attached to the end portion and extending from theend portion toward the distal second end, a head portion provided at thedistal second end, the head portion being attached to the body portion,the head portion including a distal surface and at least one couplerprovided on or adjacent the distal surface, and a passageway extendingthrough the end portion, the body portion, and the head portion, thepassageway extending between a first opening formed in the end portionand a second opening formed in the head portion, the mid-longitudinalaxis extending through the passageway, the passageway being configuredto receive a portion of the drill therethrough; a driver having a chuckconfigured to engage a portion of the drill, the driver being configuredto rotate the drill engaged to the chuck in at least one rotationaldirection; and a drill including a key portion for engaging the chuck ofthe driver, a collar portion for engaging the end portion of theadaptor, and a shaft portion including flutes facilitating removal ofmaterial from the bone.

These and other objects of the present invention will be apparent fromreview of the following specification and the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is perspective view of an adaptor or spacer assembled with acannula attached to the adaptor, a drill extending through the adaptorand the cannula, and a driver attached to the drill;

FIG. 2 is a cross-section of the assembly along Line 2-2 of FIG. 1;

FIG. 3 is an exploded perspective view of the assembly of FIG. 1;

FIG. 4 is a first enlarged perspective view of the adaptor from a firstside thereof at a distal end thereof;

FIG. 5 is a second enlarged perspective view of the adaptor from asecond side thereof at the distal end thereof;

FIG. 6 is a third enlarged perspective view of the adaptor from thesecond side thereof at a proximal end thereof;

FIG. 7 is a first enlarged perspective view of a head portion of thecannula from a first side thereof at a proximal end thereof; and

FIG. 8 is a second enlarged perspective view of the head portion of thecannula from a second side thereof at the proximal end thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

An adaptor or spacer according to one embodiment of the presentinvention is generally indicated by the numeral 10 in FIGS. 1-6. Asdepicted in FIGS. 1-3, the adaptor 10 is used in conjunction with adriver 12, a drill 14, and a cannula 16. The adaptor 10 can be used toafford placement of the drill 14 and the cannula 16 into bone such as avertebral body. For example, the use of the drill 14 and the cannula 16,as discussed below, can afford access to the interior of the vertebralbody.

When the adaptor 10, the driver 12, the drill 14, and the cannula 16 areassembled, the adaptor 10 can serve to afford forward linear forceapplied to the driver 12 to be transferred through the adaptor 10 to thecannula 16, and to prevent the drill 14 from extending more than adesired amount out of the cannula 16. Additionally, the adaptor 10 canalso serve to impart rotational movement of the drill 14 to the cannula16. As such, the adaptor 10 aids placement of the cannula 16 into bone.

As depicted in FIGS. 1-6, the adaptor 10 includes a proximal end 20 anda distal end 22 opposite from one another, and a mid-longitudinal axisextending the proximal end 20 and the distal end 22. The adaptor 10includes a end portion 24, a body portion 26, and a head portion 28.

The end portion 24 is provided at the proximal end 20, the body portion26 extends from the end portion 24 to the head portion 28, and the headportion 28 is provided at the distal end 22. As depicted in FIGS. 1-6,the end portion 24 is cylindrical, and the body portion 26 includes amiddle portion 30 and first and second reinforcing struts 32 and 34 onopposite sides of the middle portion 30. Furthermore, as depicted inFIGS. 1-6, the head portion 28 includes a proximal surface 36 and adistal surface 38 opposite from one another, a first side surface 40 anda second side surface 42 opposite from one another, a first internal webportion 44, a second internal web portion 46, and a middle portion 48.

As depicted in FIGS. 4-6, the adaptor 10 includes a passageway 50 forreceiving a portion of the drill 14 extending therethrough. Thepassageway 50 extends through the end portion 24, the middle portion 30of the body portion 26, and the middle portion 48 of the head portion28. The passageway 50 extends from a first opening 52 formed in the endportion 24 at the proximal end 20 of the adaptor 10 to a second opening54 formed in the distal surface 38 of the head portion 28 at the distalend 22 of the adaptor 10. The passageway 50 is configured to receive aportion of the drill 14 therethrough, and the passageway 50 isconfigured to receive a portion of the cannula 16 at the distal end 22.

The adaptor 10, as depicted in FIGS. 1-3, is configured for releasablycoupling to the cannula 16. To that end, the adaptor 10 includes atleast one coupler. For example, the passageway 50 adjacent the secondopening 54 can include a coupler such as threads 60, and the distalsurface 38 can include a coupler such as a first tab 62, a second tab64, and recesses 65. The threads 60, the first tab 62, the second tab64, and one of the recesses 65 can facilitate releasable coupling withthe cannula 16. Such engagement can prevent movement of the adaptor 10and the cannula 16 with respect to one another.

Furthermore, a channel 66 can extend between the proximal end 20 and thedistal end 22 of the adaptor 10. The channel 66 provides access to thepassageway 50 extending through the adaptor 10.

As depicted in FIGS. 1-3, the driver 12 includes a handle portion 70, abody portion 72, and a chuck 74. The chuck 74 includes detents 76 forfacilitating engagement with the drill 14. Furthermore, the handleportion 70 is rotatable relative to the body portion 72, and rotation ofthe handle portion 70 by a user causes corresponding rotation of thechuck 74. As such, the user can manipulate the handle portion 70 toforce the driver 12 forward linearly, and to cause rotation of the chuck74. As discussed below, such forward linear force and rotation of thechuck 74 is used to facilitate insertion of the drill 14 and the cannula16 into the vertebral body.

The drill 14, as depicted in FIGS. 1-3, includes a proximal end 80 and adistal end 82 opposite from one another. The drill 14 includes a keyportion 84 at the proximal end 80, a collar portion 86 provided adjacentthe key portion 84, a shaft portion 88 extending from the key portion 84through the collar portion 86 toward the distal end 82. The shaftportion 88 includes a tip portion 90 at the distal end 82 includingflutes facilitating removal of material from the bone. The key portion84 can be received in and engaged to the chuck portion 74 of the driver12, The key portion 84 can include a recess 91 for receiving the detents76 of the chuck 74. Furthermore, the chuck portion 74 and the keyportion 84 can be magnetized to secure the engagement therebetween. Assuch, rotation of the chuck portion 74 via manipulation of the handleportion 70 also rotates the drill 14.

The shaft portion 88 also includes various exterior markings 92 adjacentthe collar portion 86. During use of the drill 14, as discussed below,the exterior markings 92 allow the user to determine the depth of thetip portion 90 in the bone.

As depicted in FIGS. 1-3 and 7, the cannula 16 includes a proximal end100 and a distal end 102 opposite from one another. The cannula 16includes a post portion 104 at the proximal end 100, a handle portion106 adjacent the post portion 104, a pedestal portion 108 adjacent thehandle portion 106, and a shaft portion 110 extending from portions ofthe handle portion 106 and the pedestal portion 108 to the distal end102.

The post portion 104, the handle portion 106, and the pedestal portion108 can be unitarily formed with one another, and the shaft portion 110can be secured within a passageway 112 extending through the postportion 104, the handle portion 106, and the pedestal portion 108. Theshaft portion 110 includes a passageway 114 therethrough. The passageway114, together with the portion of the passageway 112 in which the shaftportion 110 is not received, form a passageway 116 extending from theproximal end 100 to the distal end 102. The passageway 116 is configuredto receive the shaft portion 88 of the drill 14 therethrough.

The shaft portion 110 also includes various exterior markings 118therealong. During use of the cannula 16, as discussed below, theexterior markings 118 allow the user to determine the depth of the shaftportion 110 in the bone.

As depicted in FIG. 7, the post portion 104 includes threads 120configured to engage the threads 60 in the passageway 50. Furthermore,the handle portion 106 includes a proximal surface 122 and a distalsurface 124 opposite from one another. The proximal surface 122 includesa first recess 126, a second recess 128, and a detent 129 formedthereon. The first recess 126 is configured to receive and engage thefirst tab 62, the second recess 128 is configured to receive and engagethe second tab 64, and the detent 129 is configured for receipt in oneof the recesses 65.

When the threads 60 and 120 are engaged with one another, and theadaptor 10 and the cannula 16 are rotated with respect to one another tocomplete engagement of the threads 60 and 120, the first recess 126comes into engagement with the first tab 62, the second recess 128 comesinto engagement with the second tab 64, and the detent 129 comes intoengagement with one of the recesses 65. Using the engagement of thethreads 60 and 120 with one another, the engagement of the first tab 62in the first recess 126, the engagement of the second tab 64 in thesecond recess 128, and the engagement of the detent 129 in one of therecesses 65, the adaptor 10 is releasably coupled to the handle portion106 of the cannula 16.

To facilitate insertion of the cannula 16 into bone, the adaptor 10, thedriver 12, the drill 14, and the cannula 16 can be assembled to oneanother as an assembly 130. Thereafter, the user can manipulate theassembly 130 to insert the shaft portion 110 of the cannula 16 into thebone. The adaptor 10 can be engaged to the handle portion 106 of thecannula 16 to prevent movement of the adaptor 10 and the cannula 16 withrespect to one another. Furthermore, the drill 14 can be engaged to thedriver 12 by inserting the key portion 84 into the chuck portion 74. Themagnetic connection between the chuck portion 74 and the key portion 84,and engagement between the detents 76 and the recess 91 serve to securethe driver 12 and the drill 14 to one another.

Thereafter, the user can manipulate the driver 12 and the drill 14 toinsert the shaft portion 88 of the drill 14 into the passageway 50through the adaptor 10 and the passageway 116 through the cannula 16.After receipt therein, the shaft portion 88 of the drill 14 can be usedto reinforce the shaft portion 110 of the cannula 16, Furthermore, thelengths of the shaft portion 88 of the drill 14 and the shaft portion110 of the cannula 16 can be selected to adjust the amount that the tipportion 90 extends out of the shaft portion 110 at the distal end 102 ofthe cannula 16. The adaptor 10 can also be sized to preventover-insertion of the tip portion 90 into the bone.

When the shaft portion 88 has been fully inserted into the adaptor 10and the cannula 16, the end portion 24 of the adaptor 10 is received atleast partially within and engages the collar portion 86 of the drill14. As depicted in FIGS. 4-6, the end portion 24 includes an exteriorsurface 140 and an end surface 142. Furthermore, the collar portion 86includes a recess 144, and as depicted in FIG. 2, the recess 144includes an interior surface 146 and an end surface 148. The end surface142 and the end surface 148 can be engaged with one another, and theexterior surface 140 and the interior surface 146 can be cylindrical toallow the drill 14 to rotate relative to the adaptor 10 withoutinterference.

Forward linear force applied to the driver 12 is transferred to thedrill 14, and engagement of the end surface 142 and the end surface 148with one another also affords such forward linear force applied to thedriver 12 to be transferred through the adaptor 10 to the cannula 16.That is, using the adaptor 10, the user can push on the driver 12 andsuch pushing force can ultimately be transferred to both the drill 14and the cannula 16. Furthermore, the exterior surface 140 and theinterior surface 146 are sized to allow the drill 14 to rotate relativeto the adaptor 10 without interference. However, the friction due tocontact between the end surface 142 and the end surface 148 can causethe adaptor 10 (and the cannula 16 attached thereto) to rotate with thedrill 14. During use of the assembly 130, simultaneous rotation of thecannula 16 with the drill 14 during linear advancement can aid thepenetration of the shaft portion 110 of the cannula 16 into the bone.

When using the assembly 130, the tip portion 90 is first contacted tothe bone. Rotation of the drill 14 via use of the driver 12 causes thetip portion 90 to penetrate the bone. In doing so, the tip portion 90forms an aperture in the bone. Furthermore, linear force applied to thedriver 12 is transferred to the drill 14 and the cannula 16. Such linearforce can aid penetration of the tip portion 90 and the shaft portion110 of the cannula 16 into the bone. Furthermore, rotation of thecannula 16 with the drill 14 can aid penetration of the shaft portion110 into the bone. The exterior markings 118 on the shaft portion 110can be used to afford insertion of the shaft portion 110 to a properdepth in the bone.

After the cannula 16 has been positioned in the bone. The drill 14 canbe removed from the passageway 50 and the passageway 116, and theadaptor 10 can be disconnected from the cannula 16. Thereafter, thedrill 14 or another instrument can be reinserted into the passageway116, The drill 14 can be used to further enlarge the aperture formed inthe bone. If using the drill 14 without the adaptor 10, the markings 92on the shaft portion 88 of the drill 14 can be used to afford insertionof the shaft portion 88 to a proper depth in the bone.

Once an aperture having a desired depth has been formed in the bone,another instrument (such as an ablation probe) can be inserted into thepassageway 116 and into the aperture formed in the bone.

Alternatively, the handle portion 106 of the cannula 16 can bemanipulated by the user to facilitate insertion thereof into the bone.The user can manipulate the handle portion 106 to insert the shaftportion 110 into the bone, and the exterior markings 118 on the shaftportion 110 can be used to afford insertion of the shaft portion 110 toa proper depth in the bone. The adaptor 10 can then be engaged to thehandle portion 106 of the cannula 16 to prevent movement of the adaptor10 and the cannula 16 with respect to one another. Thereafter, the shaftportion 88 of the drill 14 can be inserted through the passageway 50 andthe passageway 116. The drill 14 can be attached to or detached from thedriver 12 during initial insertion thereof into the passageway 50 andthe passageway 116. The driver 12 can then be used to rotate the drill14 to cause the tip portion 90 to penetrate the bone. Other embodimentsof the invention will be apparent to those skilled in the art fromconsideration of the specification and practice of the inventiondisclosed herein. It is intended that the specification and examples beconsidered as exemplary only, with a true scope and spirit of theinvention being indicated by the following claims.

Other embodiments of the invention will be apparent to those skilled inthe art from consideration of the specification and practice of theinvention disclosed herein. It is intended that the specification andexamples be considered as exemplary only, with a true scope and spiritof the invention being indicated by the following claims.

We claim:
 1. An adaptor for use with a driver, a drill, and a cannula,the adaptor comprising: a proximal first end, an opposite distal secondend, a mid-longitudinal axis extending through the proximal first endand the distal second end, a length extending between the proximal firstend and the opposite distal second end, an end portion provided at theproximal first end, the end portion being configured to engage a portionof the drill, a body portion attached to the end portion and extendingfrom the end portion toward the distal second end, a head portionprovided at the distal second end, the head portion being attached tothe body portion, the head portion including a distal surface, a firstside and an opposite second side, and a third side and an oppositefourth side, the first side and the second side of the head portionbeing spaced apart across at least the distal surface, and the thirdside and the fourth side being spaced apart across at least the distalsurface, the head portion including a first tab and a second tabextending outwardly from the distal surface, the first tab beingpositioned at or adjacent the first side of the head portion, the secondtab being positioned at or adjacent the second side of the head portion,and the first tab and the second tab being configured to respectivelyengage complimentary structures formed on the cannula, and a passagewayextending through the end portion, the body portion, and the headportion, the passageway extending between a first opening formed in theend portion and a second opening formed in the head portion, themid-longitudinal axis extending through the passageway, the passagewaybeing configured to receive a portion of the drill therethrough.
 2. Theadaptor of claim 1, further comprising at least one recess formed on thedistal surface, the at least one recess being configured to engage acomplimentary structure on the cannula.
 3. The adaptor of claim 2,further comprising threads formed in the passageway adjacent the secondopening, the threads being configured to engage complimentary threads onthe cannula.
 4. The combination of the adaptor of claim 3 with acannula, the cannula comprising a first recess for receiving the firsttab therein and a second recess for receiving the second tab therein,the engagement of the first tab with the first recess and the second tabwith the second recess preventing rotation of the adaptor and thecannula with respect to one another in at least one rotationaldirection.
 5. The combination of claim 4, wherein the cannula comprisesthe complimentary structure thereon for engaging the at least onerecess, and the complimentary structure is a detent formed thereon, andthe cannula comprises the complimentary threads thereon for engaging thethreads formed in the passageway adjacent the second opening.
 6. Theadaptor of claim 1, further comprising a channel extending along a firstside of the adaptor from the proximal first end to the distal secondend, the channel communicating with and providing access to thepassageway.
 7. The combination of the adaptor of claim 1 with a drill,the drill comprising a collar portion including an annular recess havingan annular interior surface and an end surface, wherein the end portionof the adaptor includes an annular exterior surface and an end surface,and when the end portion of the adaptor is engaged to the drill, the endportion is at least partially received in the annular recess, the endsurface of the adaptor engages the end surface of the annular recess,and the end portion and the annular recess are independently rotatablewith respect to one another.
 8. The adapter of claim 1, wherein thefirst tab is positioned adjacent the third side, and the second tab ispositioned adjacent the fourth side.
 9. The adaptor of claim 8, whereinthe first side and the second side are separated by a first distance ina first plane extending along the mid-longitudinal axis, and the thirdside and the fourth side are separated by a second distance in a secondplane extending along the mid-longitudinal axis and perpendicular to thefirst plane, the first distance being less than the second distance. 10.An assembly for removal of material from bone and placement of at leasta portion of the assembly in the bone, the assembly comprising: anadaptor having a proximal first end, an opposite distal second end, amid-longitudinal axis extending through the proximal first end and thedistal second end, a length extending between the proximal first end andthe opposite distal second end, an end portion provided at the proximalfirst end and being configured to engage a portion of a drill, a bodyportion attached to the end portion and extending from the end portiontoward the distal second end, a head portion provided at the distalsecond end, and a passageway extending through the end portion, the bodyportion, and the head portion, the head portion being attached to thebody portion, the head portion including a distal surface, a first sideand an opposite second side, and a third side and an opposite fourthside, the first side and the second side of the head portion beingspaced apart across at least the distal surface, and the third side andthe fourth side being spaced apart across at least the distal surface,the head portion including a first tab and a second tab extendingoutwardly from the distal surface, the first tab being positioned at oradjacent the first side of the head portion, and the second tab beingpositioned at or adjacent the second side of the head portion and thepassageway extending between a first opening formed in the end portionand a second opening formed in the head portion, the mid-longitudinalaxis extending through the passageway, the passageway being configuredto receive a portion of the drill therethrough; a driver having a chuckconfigured to engage a portion of the drill, the driver being configuredto rotate the drill engaged to the chuck in at least one rotationaldirection; a drill including a key portion for engaging the chuck of thedriver, a collar portion for engaging the end portion of the adaptor,and a shaft portion including flutes facilitating removal of materialfrom the bone; and a cannula having a first recess for receiving thefirst tab therein and a second recess for receiving the second tabtherein, the engagement of the first tab with the recess and the secondtab with the second recess preventing rotation of the adaptor and thecannula with respect to one another in at least one rotationaldirection.
 11. The assembly of claim 10, further comprising at least onerecess formed on the distal surface, the at least one recess beingconfigured to engage a complimentary structure on the cannula.
 12. Theassembly of claim 11, further comprising threads formed in thepassageway adjacent the second opening, the threads being configured toengage complimentary threads on the cannula.
 13. The assembly of claim12, wherein the complimentary structure of the cannula is a detentformed thereon for engaging the at least one recess formed on the distalsurface.
 14. The assembly of claim 10, further comprising a channelextending along a first side of the adaptor from the proximal first endto the distal second end, the channel communicating with and providingaccess to the passageway.
 15. The assembly of claim 10, wherein thedrill includes a collar portion including an annular recess having anannular interior surface and an end surface, the end portion of theadaptor includes an annular exterior surface and an end surface, andwhen the end portion of the adaptor is engaged to the drill, the endportion is at least partially received in the annular recess, the endsurface of the adaptor engages the end surface of the annular recess,and the end portion and the annular recess are independently rotatablewith respect to one another.
 16. The assembly of claim 10, wherein thefirst tab is positioned adjacent the third side, and the second tab ispositioned adjacent the fourth side.
 17. An assembly for removal ofmaterial from bone and placement of at least a portion of the assemblyin the bone, the assembly comprising: an adaptor having a proximal firstend, an opposite distal second end, a mid-longitudinal axis extendingthrough the proximal first end and the distal second end, a lengthextending between the proximal first end and the opposite distal secondend, an end portion provided at the proximal first end and beingconfigured to engage a portion of a drill, a body portion attached tothe end portion and extending from the end portion toward the distalsecond end, a head portion provided at the distal second end, and apassageway extending through the end portion, the body portion, and thehead portion, the head portion being attached to the body portion, thehead portion including a distal surface, a first side and an oppositesecond side, and a third side and an opposite fourth side, the firstside and the second side of the head portion being spaced apart acrossat lease the distal surface, and the third side and the fourth sidebeing spaced apart across at least the distal surface, the head portionincluding a first tab and a second tab extending outwardly from thedistal surface, the first tab being positioned at or adjacent the firstside of the head portion, the second tab being positioned at or adjacentthe second side of the head portion, and the first tab and the secondtab being configured to respectively engage complimentary structuresformed on the cannula, and the passageway extending between a firstopening formed in the end portion and a second opening formed in thehead portion, the mid-longitudinal axis extending through thepassageway, the passageway being configured to receive a portion of thedrill therethrough; a driver having a chuck configured to engage aportion of the drill, the driver being configured to rotate the drillengaged to the chuck in at least one rotational direction; and a drillincluding a key portion for engaging the chuck of the driver, a collarportion for engaging the end portion of the adaptor, and a shaft portionincluding flutes facilitating removal of material from the bone.
 18. Theassembly of claim 17, wherein the drill includes a collar portionincluding an annular recess having an annular interior surface and anend surface, the end portion of the adaptor includes an annular exteriorsurface and an end surface, and when the end portion of the adaptor isengaged to the drill, the end portion is at least partially received inthe annular recess, the end surface of the adaptor engages the endsurface of the annular recess, and the end portion and the annularrecess are independently rotatable with respect to one another.
 19. Theassembly of claim 18, further comprising a cannula, the cannulacomprising a first recess for receiving the first tab therein and asecond recess for receiving the second tab therein, the engagement ofthe first tab with the first recess and the second tab with the secondrecess.
 20. The assembly of claim 17, wherein the first tab ispositioned adjacent the third side, and the second tab is positionedadjacent the fourth side.